Fixes #173 .

Changes proposed in this pull request:

• updated ruby from 2.2.2 to 2.3.0
• update all gems required and dependencies
• stop using render nothing: true and use head :ok
• for activerecord calls use distinct instead of unq
• update all rspec controller calls to use a hash syntax
• use throw :abort in model callbacks as return false does not stop the chain
• need to fix the rake db:schema:load command
• fix all the rspec tests
• do some testing of the app and make sure it still works
• create a heroku review app and try to hit the app with errors and see if they register

This change is